[openstreetmap/openstreetmap-website] Use baselayerchange/overlaylayerchange instead of layeradd/layerremove (PR #5474)

[mmd]

With the latest changes I was able to render Lake Huron locally for the first time (455k nodes). That is definitely a significant speed-up.

![image](https://github.com/user-attachments/assets/78660720-bad3-4434-a35d-7f130316edaf)


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